function validateDigits(strCont) {
                   if (strCont.length !=  11) 
				   {
                            return false;
                   }
                   else {
                            var test = strCont.search(/[A-Za-z]{4}[0-9]+/g);
                            if (test != -1) {
                                      return true;
                            }
                            else {
                                      return false;
                            }
                   } 
         }
		 
function checkForm() {
				   //Production
				   var WimbV2URL="http://www.cma-cgm.com/eBusiness/Tracking/Default.aspx"; 
				   var QueryString="?profile=delmas&";
				   
				   var screenHeight=screen.availHeight;
				   var screenWidth=screen.availWidth;
				   var topPosition=0;
				   var leftPosition=0;
				  
				   
				   leftPosition=(screenWidth-625)/2;
				   topPosition=150;
				   
				   screenHeight-=(topPosition*2);
				   if (screenHeight<400) 
					   screenHeight=400;
					   
				   screenWidth=644;			   
				   	   
				  if (document.frmTracking.NumCont.value == '') 
				   {
								alert('Please enter a container number.');
								document.frmTracking.NumCont.focus();
								
                   }
				  else 
				  if (document.frmTracking.NumCont.value != '') 
				  			{
				  			if (!validateDigits(document.frmTracking.NumCont.value)) 
									{
                                      alert('Please enter a valid container number.');
                                      document.frmTracking.NumCont.focus();
									} 	
							else
									{
						   			   QueryString += "contnum="+document.frmTracking.NumCont.value;	   
									   window.open(WimbV2URL + QueryString, '_blank', 'height=' + screenHeight + ',width=' + screenWidth + ',top=' + topPosition + ',left=' + leftPosition + ',resizable=yes,scrollbars =yes');
				   					   return true;
									}   
							}
         }